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Re: component sizing
Original poster: "BunnyKiller by way of Terry Fritz <twftesla-at-uswest-dot-net>" <bigfoo39-at-telocity-dot-com>
Tesla list wrote:
> Original poster: "The Backs by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> I am in the process of building my first coil and I have a few questions.
> The secondary is 10.25" diameter on a PVC pipe. It has about 916 windings
> of 20GA wire. For the Primary, I am planning on using 1/4" copper tubing
> wound at a 15 degree inverse conical. the spacing between winding on the
> primary is 1/2". I have not "wound" the primary yet, but I was planning on
> 15 windings. but I have notches in my supports for up to 17 winding. I
> currently have 1 15/60 NST that I am planning on using to power it, but I
> was going to try to get at least two more of them.
> Now for the questions.
> 1. From Ed Sonderman's Excel spread sheet I was planning on trying to get
> a tank cap with a value of around .028 uF. Does this sound correct, and if
> so, what is the best way of obtaining the tank caps? I have a limited
> budget, but I am also trying to make a very nice looking coil.
go for the famous MMC style cap very versitile and adjustable if designed right
> 2. I wanted to make a RSG. I have access to some DC motors and
> controllers, but I have seen a few places mention that an async-RSG is bad
> news for NST's. should I stay away from the DC motors?
dc are usable but while adjusting of the rpms, this can be bad for the NST.
go for either a
modified AC 1725 rpm motor or find a 1800 rpm AC motor
> 3. I have some 1 1/2" acrylic that I was planning to use for the rotor of
> my RSG. I am planning on drilling and tapping 1/4-20 holes in it and using
> threaded rod with acorn nuts on the ends for my electrodes. is this a good
> plan or bad?
1.5" thick stock is a bit heavy, you will need about a 1/3 or better hp
motor to spin it up to
speed. most people use 1/2 - 1/4 " material for the disc. the electrodes
should be about 3/4 -
1" long on eac side of the disc, acorn nuts are a bit short.
> 4. RF chokes. what are some good designs, and How do I size them?
check out Terry's web page for RF filter circuits... hes got an excellent
> 5. what is the best method of constructing a toroid that would be large
> enough for my coil?
for a 10" dia secondary you will need a toroid of at least 8" (height) X
40" (width)..also a
15/60NST will have a difficult time supplying enuf power to really do
justice for a coil of
this size. Consider making your secondary about 8" dia X 24-32" tall ,
this will be more
compatible with your NST.
> Thank for your help
> Tom Back